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Once again, google books. This time "Plane Surveying", John Clayton
Tracy, 1911. Page 333 describes Lehmann's method in the chapter on
plane-table surveying. (An interesting topic of its own.)
Reading the description, it would seem the method has little bearing
(sorry) on the az-intercept method. It appears to deal with az errors
while our issue is interecept (range to a surveyer) uncertainty.
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